Portable boring machine



March 2 ,1926. 4 1,575,146

H. 5. BROWN PORTABLE BORING MACHINE Original Filed 3, 1919 3Sheets-Sheet 1 flnventor By "644 Attor e MW WWWM l Q 1 a? j. T 7 X H. 5.BROWN PORTABLE BORING MACHINE March 2 1926. 1,575,146

Original Filed 5. 1919 3 Sheets-Sheet 2 lllllmunm mumuumnmlllllll H i #8H w w k w r mum mmuuuuuillllllllll] Inventor I By q Attorney March 21926.

H. 5. BROWN PORTABLE BORING MACHINE Original Filed 5, 1919 3Sheets-Sheet 5 J 7 E J 9 O/Q/U/Qnn/ II I. W Y a r/ 4 II 7 W w 2 I 3 F m5 E 7, a 9 4 0 m ,wl/wv y I EEsEEcENFEEE-E- I i I 9 r 3 InventorPatented Mar. 2, 1926.

UNITED STATES PATENT oFFIcE.

HUGH 8. BROWN, 01' ROSELLE PARK, NEW JERSEY, ASSIGNOR TO THE HUBBONCOMPANY INC., A CORPORATION OF NEW JERSEY.

PORTABLE BORING MACHINE.

Application filed October 3, 1919, Serial No. 328,251. Renewed August 8,1925.

To all whom it may concern.

Be it known that I, HUGH S. BROWN, :1

citizen of the United States of America, re-

siding at Roselle Park, county of Union, State of New Jersey, haveinvented certain new and useful Improvements in Portable BoringMachines, of which the following is a specification.

My invention relates generally to boring apparatus and more particularlyconsists of an apparatus designed to bore holes of relatively largediameter in the earth to serve as post holes, and deeper holes ofsmaller diameter to receive charges of explosives. The best form ofapparatus at present known to me is illustrated in theaccompanying'three sheets of drawings in which,

Fig. 1 is a side elevation of the machine arranged to dig post holes,with parts broken awav.

Fig. 2 is a detail horizontal'section on line 2-2 of Fig. 1, with partsbroken away.

Fig. 3 is a front elevation of the machine, parts being broken away.

Fig. 4 is an enlarged detail vertical section of the boring) apparatusin the plane of Fig. 3, parts eing broken away.

Fig. 5 is a horizontal section on line 5-5 of Fig. 6.

Fig. 6 is a detail of the cutting end of the auger at right angles tothe plane of Fig. 4.

Fig. 7 is an elevation and partial section of the parts shown in Fi 4,on aplane at right angles to that of ig. 4, an an r of smaller diameterand greater length ing shown in position, and

Fig. 8' is a section on line H of 7.

Throughout the drawings like reference characters indicate like parts.1, is a two wheeled vehicle supporting the main frame or chassis 2,carrying a two cylinder opposed gasoline motor 3, driving throu h rocketchain 4, the main shaft 5, whic t ugh the usual friction clutch 7,operated g clutch lever 8, rotates vertical counter she 10, throughbevel gearing 9. A fan 3,.is belt driven from shaft 5. On the upper endof shaft 10, is pinion 11, meshing with gear 31, having the sleevelikehub 30 'ournaled in up r main bearin 14 carri y chassis 2. .5 verticaltoololding sleeve 12 is movable axially in hub 30, but is compelled torotale with it by means of slot 28, with which meshes key 29, on hub 30.15, is I. second or lower main bearing for sleeve 12, also carried bymain frame or chassis 2.

Bearings 14 and 15 are formed at the upper and lower ends, respectively,of an integral bearing block 43, supported at its lower end on mainframe 2, and a short horizontal shaft 26 is journaled in said bearingblock 43, between bearings 14 and 15. This compact integral constructionaffords ri'gidity combined with light weight in the support for the toolholding member 12.

13, is an upper thmstbearing formed in yoke 22, supported by verticalrack bar 24 and .16 is a lower thrust bearing carried by and clamped bysetscrew 21, in yoke 23, at the lower end of rack bar 24. An upperthrust collar 18, is clamped to sleeve 12, by set screw 19, and rests onthrust bearing 13, thereby supporting sleeve 12, in position. A lowerthrust collar 17 is clamped to the lower end of sleeve 12, by setscrews20, 20, the adjacent faces of bearing 16 and collar 17, having ballraces in which run the ball bearings best shown in Fi s. 4 and 7. Apinion 25, fast on horizonta shaft 26, journaled in main frame 2, mesheswith rack bar 24, and, when rotated by hand wheel 27, raises or lowersrack bar 24, and with it the tool holding sleeve 12, journaled in yokes22 and 23, carried by said rack bar, as previously described. 32, is aspring catch mounted on the main frame as shown in Fig. 1, and adaptedto hook under the lower end of rack bar 12, when the latter is in itshighest position, and so sup ort the rack bar 24, and sleeve 12, when te boring apparatus is not in o oration.

33, is the post ho e digging auger having a helix of about 8 to 12inches diameter, usually, the shank of which auger is held by setscrews34, 34, in collar 17 which rojects over the end of sleeve 12, and isfurt er prevented from rotating in said collar by radial pin 43,engaging slots 41, 41, in the collar. This auger has the usual centerbit 35, and the lower 'or cutting edge of the auger is formed byremovable knife 36, held in position by small stove bolts 40, 40. Aclearance cutter 37, is mounted in and extends radially from the centerbit 35, and is radially adjustable therein, being clamped in position bysetscrew 38. Its cutting edge 13 parallel to the axis of the helix andis preferably located about 180 degrees from the cutting edge of knife36.

The smaller, longer auger 3!), for boring deep holes to receiveexplosives'is shown in posltion in Fig. 7, being firmly clamped bysetscrews 34, 34 which engage the opposite faces of the helix formingthe auger.

The tool holding sleeve 12, is preferably made of such length that whenin its lowest position the tool holding thrust collar will touch theground. A telescoping tongue 42, rests on the ground when the apparatusis in operation and holds the main frame in the proper position to givethe tool the desired angle of adjustment to bore a vertical or inclinedhole. The post hole auger is relatively short, being usually about 4feet long. The smaller auger 39, is much longer, usually about 15 feetlong so that it extends all the way through sleeve 12, and when thelatter has been fed down to the limit of its axial motion, the setscrews34, 34, are loosened, the sleeve raised to its uppermost position,clamped on to the auger again and the boring. resumed. The operatorforces the angers down into the earth as they are rotated by the motor3, by turning hand wheel 27 and when the hole is dug the tool iswithdrawn by reversing the rotation of wheel 27.

During the boring the thrust of the feed motion is transmitted throughthe ball bearing, so that friction is reduced to a minimum. When thepost hole auger is used the clearance cutter 37, is adjusted so as toslightly enlarge the hole cut by the knife 36, on the cutting end of thehelix. This allows the rest of the helix to clear the walls of the holeand greatly reduces the frictional resistance to rotation, of the auger.The knife 36, or cutting end of the helix is made separate therefrom sothat it can be made of harder metal to prolong its useful life, and alsoto allow of replacement when worn out.

When it is desired to bore under a tree so as to place a dynamite chargeunder it to loosen the soil around the roots, the auger 39, is used, thetelescoping tongue 42, being shortened so as to tip the apparatusbackward and allow an inclined hole to be bored which will reachdirectly under the tree at a certain depth, dependent on its angle tothe plane of the horizon and the distance from the tree trunk at whichit is started.

This apparatus bores rapidly through any kind of soil and is only stoped when'encountering solid rock. If t e tool strikes any ordinary sizedboulder it merely worms over toward one side and bores away beside theobstacle.

Having described my invention, I claim:

1. In an earth boring machine the combination, with the main frame, of avertically arranged bearing block having its lower end fastened to saidmain frame and having vertically arranged journal bearings in its upperand lower ends, an upright, tool holding, cylindrical member adapted torotate insa'id bearings, a pinion mounted on a horizontal shaft, whichshaft is journaled in said bearing block between the said verticallyarranged journal bearings, a vertically arranged rack bar meshing withsaid pinion and connected to said tool carrying member, and means forrotating said pinion.

2, In a portable boring machine the combination, with a main frame andmotor supported thereon, of an upright tool holding sleeve, a pluralityof journal bearings for said sleeve, a vertical rack bar -to which theuppermost and lowermost of said. journal bearings are connected, anintermediate bearing having a support carried by the' main frame,gearing supported from said last mentioned bearing support and connectedto the motor and engaging the sleeve to rotate the same, and a pinionjournalled on this bearing support and meshing with the rack.

3. In a boring machine the combination of a main frame having severaljournal bearings arranged one over the other, a sleeve slidable up anddown, and rotatable, in said bearings, provided at each end with aninwardly facing thrust collar, a rack bar provided with an outwardlyfacing thrust bearing at each end surrounding the sleeve and adapted tocooperate with the opposing thrust collar on the sleeve, a gear wheelhaving a hollow hub slidably mounted on the sleeve and rotatably mountedin one of the above mentioned journal hearings in the main frame, meansfor rotating said gear wheel, a pinion journaled in the main frame andmeshing with the rack, and means for clamping a boring tool in saidsleeve.

HUGH s. BROWN.-

